linux-kernel - Re: [patch V4 00/10] rtmutex: Code clarification and optimization

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Date:	Sun, 22 Jun 2014 10:45:07 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [patch V4 00/10] rtmutex: Code clarification and optimization


* Thomas Gleixner <tglx@...utronix.de> wrote:

> Hopefully the last iteration of this.
> 
> I addressed all the review comments and added the following new ones:
> 
> 1/n: plug unlock race.
>    
> 	Patch was separately posted already in the safety of
>    	*mutex_unlock() thread.
> 
> 2/n: Document and simplify the trylock path
> 
> 3/n: Document and simplify try_to_take_rtmutex()

JFYI, the Blackfin cross-build fails with:

/home/mingo/tip/kernel/locking/rtmutex.c: In function 'rt_mutex_adjust_prio_chain':
/home/mingo/tip/kernel/locking/rtmutex.c:739: error: unable to find a register to spill in class 'CCREGS'
/home/mingo/tip/kernel/locking/rtmutex.c:739: error: this is the insn:
(insn 82 75 107 2 /home/mingo/tip/kernel/locking/rtmutex.c:487 (set 
(reg:BI 186)
        (eq:BI (reg/v/f:SI 9 P1 [orig:85 top_waiter ] [85])
            (const_int 0 [0x0]))) 111 {compare_eq} (nil))
/home/mingo/tip/kernel/locking/rtmutex.c:739: confused by earlier errors, bailing out

Thanks,

	Ingo
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